SPF, DKIM and DMARC for Developers: Why Your Contact Form Emails Land in Spam
The form works, the server says "sent", and the message never reaches the inbox. A practical walkthrough of email authentication with the real dig output and headers you need to read.
🎯 Vulnerability: Web Security Vulnerability
💡 Defense Fix: Implement strict input validation, contextual output encoding, and enforce least-privilege authorization controls.